Why won't my Lenovo A5000 turn on?

so here's what happened to my phone.... my phone was dead because the battery was drained, so I charged it. After half an hour I tried to open my phone, it responded, but the screen was still black. I tried to reboot it but still the screen is black. What to do? Help me please

Have you tried waiting for a few minutes? I found some phones showing "optimizing Android ... " when battery is drained. Does the screen light up?

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